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Synonyms
un·known (ŭn-nōń)

adjective 

  1. Not known; unfamiliar: a modern-day problem unknown in earlier times.
    1. Not identified or ascertained: received flowers from an unknown admirer.
    2. Not established or verified.
  3. Not well known or widely known: an unknown artist.

noun 

    1. A person or thing that is unknown: “the abyss of the unknown” (Helena Petrovna Blavatsky)
    2. A person who is not well known, as to the general public: cast an unknown in the starring role.
  2. Mathematics A quantity of unknown numerical value.